From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5EA8DC3DA4A for ; Thu, 1 Aug 2024 16:04:12 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EB2946B0089; Thu, 1 Aug 2024 12:04:11 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id E3B226B008C; Thu, 1 Aug 2024 12:04:11 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id CDBFF6B0092; Thu, 1 Aug 2024 12:04:11 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id A319A6B0089 for ; Thu, 1 Aug 2024 12:04:11 -0400 (EDT) Received: from smtpin25.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay04.hostedemail.com (Postfix) with ESMTP id 5AF3A1A0BE0 for ; 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s=arc-20220608; d=hostedemail.com; t=1722528193; a=rsa-sha256; cv=none; b=A0AG2RRpCFpSDuc/RTbht9szhY/G1WFrFXKnyW2jCLGf6xQo+i9H9lAOfOnMRpkzQhnYg4 PPVKd83u25QfmNMIZz1lg6Sd34VxfMP3aQbMpkKB3pT5CKg3aRxyPYn1Lwpauy2ruIjGC6 26Fc0gWdl1NyJFsdOWQxhtxPK+dO/yw= ARC-Authentication-Results: i=1; imf20.hostedemail.com; dkim=none; dmarc=pass (policy=none) header.from=arm.com; spf=pass (imf20.hostedemail.com: domain of joey.gouly@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=joey.gouly@arm.com Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 682601007; Thu, 1 Aug 2024 09:04:34 -0700 (PDT) Received: from e124191.cambridge.arm.com (e124191.cambridge.arm.com [10.1.197.45]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C48DD3F5A1; Thu, 1 Aug 2024 09:04:05 -0700 (PDT) Date: Thu, 1 Aug 2024 17:04:03 +0100 From: Joey Gouly To: Dave Martin Cc: linux-arm-kernel@lists.infradead.org, akpm@linux-foundation.org, aneesh.kumar@kernel.org, aneesh.kumar@linux.ibm.com, bp@alien8.de, broonie@kernel.org, catalin.marinas@arm.com, christophe.leroy@csgroup.eu, dave.hansen@linux.intel.com, hpa@zytor.com, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, maz@kernel.org, mingo@redhat.com, mpe@ellerman.id.au, naveen.n.rao@linux.ibm.com, npiggin@gmail.com, oliver.upton@linux.dev, shuah@kernel.org, szabolcs.nagy@arm.com, tglx@linutronix.de, will@kernel.org, x86@kernel.org, kvmarm@lists.linux.dev Subject: Re: [PATCH v4 10/29] arm64: enable the Permission Overlay Extension for EL0 Message-ID: <20240801160403.GD841837@e124191.cambridge.arm.com> References: <20240503130147.1154804-1-joey.gouly@arm.com> <20240503130147.1154804-11-joey.gouly@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 936A01C0034 X-Stat-Signature: nf9znsctcamiojx7zqtwbbo1qfzx9ket X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1722528249-613458 X-HE-Meta: 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 McoxTleI zqsdc+M6TYiUqytnkSVuK7ke3VIb+b3cLE/HzbPe6EmmY9wFLWF+UVGvpmyuBy04prLZtEbBBKlmTr5rkAWLvbA3cLQcRrtYh63oGgL6mTaBlyfXOTToxAbJdiLNjoOO0zZtP9Gs/3kR9CCqPDCXqVnAmkxsP8VJno9tXsHEO2tPe8vFJE4Yt+Z7ksYySGEK17R3WIX6b7t2fvHAHpBj3/TtKfddz+iEHE14mcBi0qTCRPzsoIDUyvYUWYLuY8DmVhEYOOj4Qqm+IQEo= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Jul 25, 2024 at 04:49:08PM +0100, Dave Martin wrote: > On Fri, May 03, 2024 at 02:01:28PM +0100, Joey Gouly wrote: > > Expose a HWCAP and ID_AA64MMFR3_EL1_S1POE to userspace, so they can be used to > > check if the CPU supports the feature. > > > > Signed-off-by: Joey Gouly > > Cc: Catalin Marinas > > Cc: Will Deacon > > --- > > > > This takes the last bit of HWCAP2, is this fine? What can we do about more features in the future? > > > > > > Documentation/arch/arm64/elf_hwcaps.rst | 2 ++ > > arch/arm64/include/asm/hwcap.h | 1 + > > arch/arm64/include/uapi/asm/hwcap.h | 1 + > > arch/arm64/kernel/cpufeature.c | 14 ++++++++++++++ > > arch/arm64/kernel/cpuinfo.c | 1 + > > 5 files changed, 19 insertions(+) > > > > diff --git a/Documentation/arch/arm64/elf_hwcaps.rst b/Documentation/arch/arm64/elf_hwcaps.rst > > index 448c1664879b..694f67fa07d1 100644 > > --- a/Documentation/arch/arm64/elf_hwcaps.rst > > +++ b/Documentation/arch/arm64/elf_hwcaps.rst > > @@ -365,6 +365,8 @@ HWCAP2_SME_SF8DP2 > > HWCAP2_SME_SF8DP4 > > Functionality implied by ID_AA64SMFR0_EL1.SF8DP4 == 0b1. > > > > +HWCAP2_POE > > + Functionality implied by ID_AA64MMFR3_EL1.S1POE == 0b0001. > > Nit: unintentionally dropped blank line before the section heading? Now there's only one blank line, I think c1932cac7902a8b0f7355515917dedc5412eb15d unintentionally added 2 blank lines, before that it was always 1! > > > > > 4. Unused AT_HWCAP bits > > ----------------------- > > [...] > > Cheers > ---Dave